TATA Motors Safari 2.2 VTT Dicor Owner's Manual - page 93
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D R I V I N G
LIMITED SLIP DIFFERENTIAL AND FOUR WHEEL DRIVING
Thus unnecessary spinning of one wheel is avoided and torque
is transmitted to both wheels, thus assisting the vehicle to traverse
loose terrain. However during normal driving, the differential
action takes place in the same manner as in a standard differential.
1. Four Wheel Drive Operation
In 2-H mode, only the rear two wheels of the vehicle are
powered by the engine and the front wheels are merely
pushed. By shifting to four wheel drive mode (4H or 4L)
the rear as well as the front axles get geared to the engine
through transfer case and transmit the engine power to all
four wheels. This gives the vehicle increased traction.
In 4H mode, the transmitted engine torque and vehicle
speed remain the same as in 2H. However, when you shift
to 4L mode engine torque is multiplied and vehicle moves
at low speed in the same gears with increased traction. 4L
mode is provided for negotiating sharp gradients or driving
through loose soil/sand.
2. Shifting from 2H to 4H
Turn the selector knob from 2H to 4H position. 4H indicator
on instrument panel will light up. Changing from 2H to 4H
can be done at any speed upto 65 km/h (40 mph). No
pressing of clutch pedal is required.
3. Shifting from 4H to 2H
Turn the selector knob from 4H to 2H position. 4H indicator
on instrument panel will go off. Changing from 4H to 2H
can be done at any speed upto 65 km/h (40 mph). No
pressing of clutch pedal is required.
Free Wheeling of Front Hub
After shifting from 4H to 2H, for effecting free wheeling of front
wheels, direction of vehicle motion needs to be changed. If
the vehicle was moving forward in 4H then bring it to halt and
engage reverse gear of main gear box. (If it was moving reverse
in 4H mode then stop it, and then engage forward gear of
main gear box.) After stopping and changing the gear the
vehicle must travel in opposite direction for a minimum of three
meters, before free wheeling takes place.
4. Shifting from 4H to 4L
Stop the vehicle. Press clutch pedal. Turn the selector knob
from 4H to 4L position. 4L indicator light on instrument panel
will blink few times and remain on.
5. Shifting from 4L to 4H
Stop the vehicle. Press clutch pedal. Turn the selector knob
from 4L to 4H position. 4H indicator light on instrument panel
will blink few times and will remain on.